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     Ohm's law is a pretty accurate one for conductors that conduct electrons (like metals), usually at or not too low. When the temperature is as low as a certain temperature, the metal conductor may enter the superconducting state from the normal state. The resistance of the conductor in the superconducting state disappears, and current can be carried without the application of voltage. For this case, Ohm's law of course no longer applies.

     For ionically conductive conductors such as electrolytes (aqueous solutions of acids, bases, and salts), Ohm's law also applies when the temperature or temperature range is generally not too large. However, under the condition of gas ionization, the conductive state presented, and some conductive devices, such as electron tubes, transistors, etc., Ohm's law does not hold.

     Electrical Engineering and Electronic Engineering

     In electrical and electronic engineering, Ohm's law is invaluable because it expresses the relationship between voltage and current at the macroscopic level, that is, the relationship between the voltage across a circuit element and the current flowing through it.

     In physics, for the study of the electrical properties of matter at the microscopic level, Ohm's law will be used, which is expressed by a vector equation as , a uniform cross-section conductor (eg, wire) in a uniform external electric field.

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